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// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![feature(phase)]
#[phase(plugin)] extern crate green;
green_start!(main)
fn start(n_tasks: int, token: int) {
let (tx, mut rx) = channel();
tx.send(token);
for i in range(2, n_tasks + 1) {
let (tx, next_rx) = channel();
spawn(proc() roundtrip(i, tx, rx));
rx = next_rx;
}
spawn(proc() roundtrip(1, tx, rx));
}
fn roundtrip(id: int, tx: Sender<int>, rx: Receiver<int>) {
for token in rx.iter() {
if token == 1 {
println!("{}", id);
break;
}
tx.send(token - 1);
}
}
fn main() {
let args = std::os::args();
let args = args.as_slice();
let token = if std::os::getenv("RUST_BENCH").is_some() {
2000000
} else {
args.get(1).and_then(|arg| from_str(arg.as_slice())).unwrap_or(1000)
};
let n_tasks = args.get(2)
.and_then(|arg| from_str(arg.as_slice()))
.unwrap_or(503);
start(n_tasks, token);
}
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